The BKB series duct fan is build-in double inlet forward curve centrifugal fans. Than fan is driven by LKB series external rotor motor. The BKB series includes 9 models. The air volume and total pressure range from 1000m³/h to 20000m³/h and 200Pa to 600Pa. Customers can request a different site on the noise, can be used with BKBS-type silencer box to meet the requirements of low noise. Pipe fan of series special motors can be configured through the three-phase voltage regulator, SCR voltage regulator, inverter and other means of speed, changing to meet system load requirements. Impeller Diameter:200-500mm Air volume Range:500-20000 m³/h Total pressure Range: up to 600 Pa Drive Type: Direct Drive Model: 200,225,250,280,315,355,400,450,500 Installation Type: Seat installation, hoisting installation Applications: Mute ventilation, purification ventilation.